Another key Part D figure, the Part D base beneficiary premium, will rise slightly, to $31.17, from $31.08, Spitalnic says.

The base beneficiary premium is a measure of the amount consumers are likely to pay for coverage.

CMS also announced the amounts higher-income consumers who get Part D coverage will have taken out of their Social Security checks each month.

Congress created the "monthly adjustment amounts" by adding Section 3308 to the Patient Protection and Affordable Care Act of 2010 (PPACA), to reduce the federal Part D drug coverage subsidy for individuals with annual incomes over $85,000 and couples with annual incomes over $170,000.